"The Environmental Protection Agency said on Tuesday that it would require the nation’s biggest emitters of greenhouse gases to start tracking their emission levels on Jan. 1 and report them to the government.

The E.P.A. said the reporting would cover roughly 85 percent of the greenhouse-gas emissions in the United States linked to global warming.

The new rules would require 10,000 industrial sites and suppliers of petroleum products to submit the data beginning in 2011. Suppliers of fossil fuels will be asked to estimate how much carbon dioxide, methane and other greenhouse gases are emitted when the fuels are burned by businesses and consumers in buildings and cars, the agency said."